KR20190068934A - Transparent display device and method of manufacturing the same - Google Patents

Abstract

The present invention provides a transparent display device capable of preventing decrease in transmittance; and a manufacturing method thereof. The transparent display device comprises: a first display panel having a first align key; a light control device disposed on one side of the first display panel; and a second display panel disposed on one side of the light control device and having a second align key. A shape of the first align key and a shape of the second align key are symmetrical to each other.

Description

TECHNICAL FIELD [0001] The present invention relates to a transparent display device and a method of manufacturing the same.

The present invention relates to a transparent display device and a method of manufacturing the same.

Recently, as the information age is approaching, a display field for processing and displaying a large amount of information has been rapidly developed, and various display devices have been developed in response to this.

Specific examples of such a display device include a liquid crystal display device (LCD), a plasma display panel (PDP), a field emission display device (FED), an electroluminescent display device An electroluminescence display device (ELD), and an organic light emitting diode device (OLED). The display device has excellent performance in terms of thinness, light weight, and low power consumption, and the application field of the display device is continuously increasing. In particular, in most electronic devices and mobile devices, a display device is used as one of the user interfaces.

In recent years, studies have been actively conducted on a transparent display device in which a user can see objects or images located on opposite sides of a display device.

The transparent display device has advantages of space utilization, interior and design, and can have various application fields. The transparent display device realizes the functions of information recognition, information processing, and information display in a transparent electronic device, thereby solving the spatial and visual restrictions of the existing electronic device. Such a transparent display device can be used for a smart window, and a smart window can be applied to a smart home or a smart car window.

In addition, a dual transparent display device in which the same image can be viewed on both the front and back sides of the transparent display device, or different images can be seen on the front and back sides by implementing the transparent display device in a dual mode has been developed.

Among them, the transparent display device implemented with the organic light emitting display has the advantage that the power consumption is low, but the contrast ratio is lowered in the environment of light. The contrast ratio of the dark environment can be defined as dark room contrast ratio, and the contrast ratio of light environment can be defined as bright room contrast ratio. That is, since the transparent display device has a transmissive area in order to make it possible to see an object or a background located on the rear surface, there is a problem that the bright-room contrast ratio is lowered. Therefore, there is a need for a light control device capable of implementing a light-shielding mode for blocking light and a transmission mode for transmitting light in order to prevent the bright-room contrast ratio from being degraded when the transparent display device is implemented as an organic light-

Therefore, in the dual transparent display device implemented by the organic light emitting diode display, the first display panel, the light control device, and the second display panel are attached in order, and the transmissive area provided on the first display panel and the transmissive area provided on the second display panel There is a problem that the transmittance of the transmissive region may be lowered.

Disclosure of Invention Technical Problem [8] The present invention has been made to solve the above problems, and it is an object of the present invention to provide a transparent display device and a method of manufacturing the same that can prevent the transmittance from being lowered.

According to an aspect of the present invention, there is provided a display device including a first display panel having a first alignment key, a light control device disposed on one side of the first display panel, And a second display panel having an alignment key, wherein the shape of the first alignment key and the shape of the second alignment key are symmetrical to each other, and a method of manufacturing the same.

According to the present invention, since the first alignment key disposed on the first display panel and the second alignment key disposed on the second display panel are symmetrical to each other, When looking down toward the display panel, if the two symmetrical first alignment keys and the second alignment key are seen in one form, it is confirmed that the first display panel and the second display panel are properly aligned have.

Therefore, it is possible to prevent a problem that the transmittance of the first and second transmissive regions is lowered because the first display panel and the second display panel are not properly aligned.

The effects obtained in the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description .

1 is a perspective view showing a transparent display device according to an embodiment of the present invention.
2 is an exploded perspective view showing a transparent display device according to an embodiment of the present invention in detail.
3 is a plan view showing a first display panel of a transparent display device according to an embodiment of the present invention.
4 is a cross-sectional view of the pixel of the first display panel, taken along line I-I 'of FIG.
5 is a cross-sectional view of the pixel of the second display panel, taken along line II-II 'of FIG. 2;
6A-6D are plan views illustrating an alignment key according to various embodiments of the present invention.
7 is a plan view showing a light control device according to an embodiment of the present invention.
8 is a cross-sectional view taken along the line III-III 'in FIG.
9 is a view illustrating a method of manufacturing a transparent display device according to an embodiment of the present invention.

The meaning of the terms described herein should be understood as follows.

The word " first, "" second," and the like, used to distinguish one element from another, are to be understood to include plural representations unless the context clearly dictates otherwise. The scope of the right should not be limited by these terms. It should be understood that the terms "comprises" or "having" does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof. It should be understood that the term "at least one" includes all possible combinations from one or more related items. For example, the meaning of "at least one of the first item, the second item and the third item" means not only the first item, the second item or the third item, but also the second item and the second item among the first item, Means any combination of items that can be presented from more than one. The term "on" means not only when a configuration is formed directly on top of another configuration, but also when a third configuration is interposed between these configurations.

Hereinafter, preferred embodiments of a transparent display device and a method of manufacturing the same according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, like reference numerals are used to denote like elements throughout the drawings, even if they are shown on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a transparent display device according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing a transparent display device in detail according to an embodiment of the present invention. 3 is a plan view showing a first display panel of a transparent display device according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of the pixel of the first display panel, taken along the line I-I 'of FIG. 2, and FIG. 5 is a cross-sectional view of the pixel of the second display panel taken along line II-II' of FIG.

Hereinafter, a transparent display device according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5. FIG. In FIGS. 1 to 5, the X axis represents the direction parallel to the gate lines, the Y axis represents the direction parallel to the data lines, and the Z axis represents the height direction of the transparent display device.

1 to 5, a transparent display device according to an embodiment of the present invention includes a first display panel 100, a light control device 200, and a second display panel 300.

Although the transparent display device according to an embodiment of the present invention has been described as being implemented with an organic light emitting display device, it may be implemented as a liquid crystal display device or an electrophoresis display device .

The first display panel 100 includes a first display substrate 110, a gate driver 120, a source drive integrated circuit (IC) 130, a flexible film 140, A board 150, and a timing controller 160. [

The first display substrate 110 includes a first lower substrate 111 and a first upper substrate 112. The first upper substrate 112 may be a sealing substrate. The first lower substrate 111 is formed to be larger than the first upper substrate 112 so that a part of the first lower substrate 111 can be exposed without being covered by the first upper substrate 112. Gate lines and data lines are formed in the display area DA of the first display substrate 110, and light emitting parts may be formed in the intersecting areas of the gate lines and the data lines. The light emitting units of the display area DA can display an image.

The display area DA includes a first transmissive area TA1 and a first light emitting area EA1 as shown in FIGS. The first display panel 100 can see an object or a background located on the back surface of the first display panel 100 due to the first transmissive areas TA1, So that an image can be displayed. The first transmissive area TA1 is an area through which the incident light is substantially transmitted, and the first light emitting area EA1 is a light emitting area.

The first light emitting region EA1 may include a plurality of pixels P. [ For example, each of the pixels P may include a red light emitting portion RE, a green light emitting portion GE, and a blue light emitting portion BE, and may further include a white light emitting portion WE . Alternatively, each of the pixels P may include at least two light emitting portions among a red light emitting portion, a green light emitting portion, a blue light emitting portion, a yellow light emitting portion, a magenta light emitting portion, and a cyan light emitting portion . The green light emitting portion GE is a region for emitting green light, the blue light emitting portion BE is a region for emitting blue light, the white light emitting portion WE is a region for emitting red light, Emitting region. The red light emitting portion RE, the green light emitting portion GE, the blue light emitting portion BE and the white light emitting portion WE of the light emitting region EA emit predetermined light, Corresponds to the transmission region.

A transistor T, an anode electrode (AND), an organic layer (EL), a light emitting layer (EL), and a blue light emitting portion (RE), a green light emitting portion GE, a blue light emitting portion BE, A cathode electrode (CAT) may be provided.

The transistor T includes an active layer ACT provided on the first lower substrate 111, a first insulating film I1 provided on the active layer ACT, a gate electrode GE provided on the first insulating film I1, A second insulating film I2 provided on the gate electrode GE and a second insulating film I2 provided on the second insulating film I2 and connected to the active layer ACT through the first and second contact holes CNT1 and CNT2 And includes a source electrode SE and a drain electrode DE. 4, the transistor T is formed in a top gate manner. However, the present invention is not limited thereto, and the gate electrode GE may be formed in a bottom gate manner under the active layer ACT .

remind The anode electrode AND is connected to the drain electrode DE of the transistor T through the third contact hole CNT3 passing through the interlayer insulating film ILD provided on the source electrode SE and the drain electrode DE . A bank B is provided between the adjacent anode electrodes (AND), so that the adjacent anode electrodes (AND) can be electrically isolated.

The organic layer (EL) is provided on the anode electrode (AND). The organic layer EL may include a hole transporting layer, an organic light emitting layer, and an electron transporting layer. The cathode electrode (CAT) is provided on the organic layer (EL) and the bank (B). When a voltage is applied to the anode electrode (AND) and the cathode electrode (CAT), holes and electrons move to the organic light emitting layer through the hole transporting layer and the electron transporting layer, respectively.

In FIG. 4, the first display panel 100 is implemented as a top emission type. However, the present invention is not limited thereto, and may be implemented by a bottom emission method. In the top emission type, since the light of the organic layer EL emits in the direction of the first upper substrate 112, the transistor T may be provided broadly below the bank B and the anode electrode AND. Accordingly, the front emission type has an advantage that the design area of the transistor T is wider than that of the back emission type. In the front emission type, it is preferable that the anode electrode (AND) is formed of a metal material having a high reflectivity such as aluminum, a laminate structure of aluminum and ITO, and the cathode electrode (CAT) is formed of a transparent metal material such as ITO or IZO.

However, it is preferable that the image emitted from the first display panel 100 is not directed to the light control device 200 but to the other side not in contact with the light control device 200.

The first display panel 100 according to an embodiment of the present invention includes a first alignment key K1. The first alignment key K1 is disposed in the first transmissive area TA1 of the first display panel 100. [ Accordingly, the first alignment key K1 according to an embodiment of the present invention may be made of a transparent material for transmitting light. At least two first alignment keys K1 are provided, and six or more first alignment keys K1 are preferably provided. For example, when six first alignment keys K1 are provided as shown in FIG. 1, four are arranged at each corner of the first display panel 100, and two of the first alignment keys K1 may be further disposed.

In addition, the first alignment key K1 according to an embodiment of the present invention is formed of a quarter-wave plate (qwp). The quarter wave plate (qwp) is an optically anisotropic plate. When linearly polarized light is incident vertically, it becomes circularly polarized light. Conversely, when circularly polarized light is incident, it becomes linearly polarized. The first display panel 100 according to an embodiment of the present invention includes the first alignment key K1 made of a transparent material and the first alignment key K1 made of a transparent material, The position can be recognized.

The first alignment key K1 may be provided under the bank B or on the first upper substrate 112 according to an embodiment of the present invention. More specifically, the first alignment key K1 may be disposed on the upper portion of the first insulating film I1, the upper portion of the second insulating film I2, and the upper portion of the interlayer insulating film ILD.

A detailed description of the first aline key K1 according to an embodiment of the present invention will be described with reference to a second aline key K2 described later.

remind The gate driver 120 supplies the gate signals to the gate lines according to the gate control signal input from the timing controller 160. In FIG. 3, the gate driver 120 is formed in a gate driver in panel (GIP) manner on one side of the display area DA of the first display substrate 110, but the present invention is not limited thereto. That is, the gate driver 120 may be formed by a GIP method on both sides of the display area DA of the first display substrate 110, or may be formed of a driving chip, mounted on a flexible film, Or may be attached to the first display substrate 110 in a similar manner.

remind The source driver IC 130 receives the digital video data and the source control signal from the timing controller 160. The source driver IC 130 converts the digital video data into analog data voltages according to the source control signal and supplies the analog data voltages to the data lines. When the source drive IC 130 is fabricated from a driving chip, the source drive IC 130 may be mounted on the flexible film 140 using a chip on film (COF) method or a chip on plastic (COP) method.

Since the first lower substrate 111 is larger than the first upper substrate 112, a part of the first lower substrate 111 can be exposed without being covered by the first upper substrate 112. [ Pads, such as data pads, are provided on a portion of the first lower substrate 111 exposed by the first upper substrate 112. Wires connecting the pads to the source drive IC 130 and wirings connecting the pads to the wirings of the substrate circuit board 150 may be formed on the flexible film 140. The flexible film 140 is adhered to the pads using an anisotropic conducting film, whereby the pads and the wirings of the flexible film 140 can be connected.

remind The substrate circuit board 150 may be attached to the flexible films 140. The substrate circuit board 150 may be mounted with a plurality of circuits implemented with driving chips. For example, the timing control unit 160 may be mounted on the substrate circuit board 150. The substrate circuit board 150 may be a printed circuit board or a flexible printed circuit board.

remind The timing controller 160 receives digital video data and a timing signal from an external system board (not shown). The timing control unit 160 generates a gate control signal for controlling the operation timing of the gate driving unit 120 and a source control signal for controlling the source drive ICs 130 based on the timing signal. The timing controller 160 supplies a gate control signal to the gate driver 120 and a source control signal to the source driver ICs 130. [

Since the first display panel 100 has the first transmissive area TA1 in order to make it possible to see an object or a background located on the back surface thereof, there is a problem that the bright contrast ratio is lowered . Therefore, there is a need for a light control device 200 capable of realizing a light-shielding mode for blocking light in order to prevent the bright-room contrast ratio from lowering when information is displayed on the first display panel 100. [

remind The light control device 200 can block the light incident in the light shielding mode and transmit the light incident in the light transmission mode. The light control device 200 according to an embodiment of the present invention includes a first base film and a second base film facing each other, and liquid crystal cells and barrier ribs disposed between the first base film and the second base film do. In the light control device 200, the liquid crystal region LA in which the liquid crystal cells are arranged and the barrier ribs PA in which the ribs are arranged are repeatedly arranged

The transparent display device according to an embodiment of the present invention can be realized by applying the light control device 200 between the first display panel 100 and the second display panel 300 to reduce the contrast ratio and brightness Can be prevented. A detailed description of the light control device 200 according to one embodiment of the present invention will be described later with reference to FIGS. 8 and 9. FIG.

On the other hand, an adhesive layer (not shown) is disposed between the first display panel 100 and the light control device 200, and between the light control device 200 and the second display panel 300, ), The light control device 200, and the second display panel 300 can be bonded. The adhesive layer (not shown) may be a transparent adhesive such as OCA (optically clear adhesive) or a transparent adhesive such as OCR (optically clear resin). In this case, the adhesive layer (not shown) may have a refractive index of 1.4 to 1.9 for refractive index matching between the first display panel 100 and the light control device 200, but is not limited thereto.

The second display panel 300 includes a display substrate, a gate driver, a source driver integrated circuit (IC), a flexible film, a substrate circuit board, And a timing control unit. In the following description, only the second display substrate 310 of the second display panel 300 will be described, and redundant description of the same components as those of the first display panel 100 will be omitted.

The second display substrate 310 includes a second lower substrate 311 and a second upper substrate 312. Gate lines and data lines are formed in the display area DA of the second display substrate 310 and light emitting parts may be formed in the intersecting areas of the gate lines and the data lines. The light emitting units of the display area DA can display an image.

The display area DA includes a second transmissive area TA2 and a second light emitting area EA2 as shown in Figs. 2 and 5. The second display panel 300 can see the object or the background located on the back surface of the second display panel 300 due to the second transmissive areas TA2, So that an image can be displayed. The second transmissive area TA2 is an area through which the incident light is substantially transmitted, and the second light emitting area EA2 is an area that emits light.

The second light emitting region EA2 may include a plurality of pixels P. [ For example, each of the pixels P may include a red light emitting portion RE, a green light emitting portion GE, and a blue light emitting portion BE, and may further include a white light emitting portion WE .

5, a transistor T, an anode electrode (AND), an organic layer (EL), and an organic layer (EL) are formed on the red light emitting portion RE, the green light emitting portion GE, the blue light emitting portion BE, A cathode electrode (CAT) may be provided. 5, the transistor T is formed in a top gate manner. However, the present invention is not limited thereto, and the gate electrode GE may be formed in a bottom gate manner disposed under the active layer ACT .

5, the second display panel 300 is implemented by a top emission method. However, the present invention is not limited to this, and the second display panel 300 may be implemented by a bottom emission method. In the top emission type, since the light of the organic layer EL emits in the direction of the second upper substrate 312, the transistor T may be provided broadly under the bank B and the anode electrode AND. Accordingly, the front emission type has an advantage that the design area of the transistor T is wider than that of the back emission type. In the front emission type, it is preferable that the anode electrode (AND) is formed of a metal material having a high reflectivity such as aluminum, a laminate structure of aluminum and ITO, and the cathode electrode (CAT) is formed of a transparent metal material such as ITO or IZO.

However, it is preferable that the image emitted from the second display panel 300 is not directed to the light control device 200 but to the other side not in contact with the light control device 200.

The second display panel 300 according to an embodiment of the present invention includes a second alignment key K2. And the second alignment key K2 is disposed in the second transmissive area TA2 of the second display panel 300. [ Therefore, the second alignment key K2 according to an embodiment of the present invention may be made of a transparent material for transmitting light. At least two second alignment keys K2 are provided, and six or more of the second alignment keys K2 are preferably provided. For example, when six second alignment keys K2 are provided as shown in FIG. 1, four are disposed at each corner of the first display panel 100, and two of the second alignment keys K2 may be further disposed.

Also, the second key K2 according to an embodiment of the present invention comprises a quarter-wave plate (qwp). The quarter wave plate (qwp) is an optically anisotropic plate. When linearly polarized light is incident vertically, it becomes circularly polarized light. Conversely, when circularly polarized light is incident, it becomes linearly polarized. The second display panel 300 according to an embodiment of the present invention may be configured such that the second alignment key K2 is configured as a quarter wave plate qwp so that the second alignment key K2 made of a transparent material The position can be recognized. The second alignment key K2 may be provided under the bank B or on the second upper substrate 312 according to an embodiment of the present invention. More specifically, the second alignment key K2 may be disposed on the upper portion of the first insulating film I1, the upper portion of the second insulating film I2, and the upper portion of the interlayer insulating film ILD.

However, the second alignment key K2 according to the embodiment of the present invention is arranged so as not to overlap with the first alignment key K1. For example, the second alignment key K2 according to an embodiment of the present invention may have a left half shape (hereinafter, left half cross shape) when the cross shape is cut in the longitudinal direction. At this time, the first alignment key K1 according to an embodiment of the present invention may have a right half cross shape symmetrical with the second alignment key K2. Therefore, when the transparent display device is viewed from the first display panel 100 toward the second display panel 300, since the first alignment key K1 and the second alignment key K2 do not overlap each other The left half-cross and the right half-cross appear as a cross.

When the transparent display device is viewed from the first display panel 100 to the second display panel 300 in this manner, the two first alignment keys K1 and the second alignment keys K2 symmetrical with each other It can be seen that the first display panel 100 and the second display panel 300 are properly aligned so that the first display panel 100 and the second display panel 300 Can be prevented from being properly aligned and the transmittance of the first and second transmissive areas TA1 and TA2 may be lowered.

As described above, in the transparent display device according to an embodiment of the present invention, the first transmissive area TA1 of the first display panel 100 and the second transmissive area TA2 of the second display panel 300 Overlap. As a result, the transparent display device according to an exemplary embodiment of the present invention includes the first transmissive area TA1 of the first display panel 100 and the second transmissive area TA2 of the second display panel 300, You can see the objects or background.

In addition, the light control device 200 of the transparent display device according to an embodiment of the present invention includes a liquid crystal region LA capable of implementing a light shielding mode and a barrier region PA in which a plurality of barrier ribs are disposed. At this time, the transparent display device according to an embodiment of the present invention is configured such that the first transmissive area TA1 of the first display panel 100 and the second transmissive area TA2 of the second display panel 300 are connected to the light control device 300 overlap with the liquid crystal region LA. The transparent display device according to an embodiment of the present invention may include a first light emitting area EA1 of the first display panel 100 and a second light emitting area EA2 of the second display panel 300, The barrier rib region PA may be overlapped with the barrier rib region PA.

Therefore, when a voltage is not applied to the light control device 200, the transparent display device according to an embodiment of the present invention can display an object located on the back side of the transparent display device through the liquid crystal region LA and the transmissive region TA, You can see the background. In the transparent display device according to an embodiment of the present invention, the light emitted from the first light emitting area EA1 of the display panel 100 and the second light emitting area EA2 of the second display panel 300 is incident on the barrier rib It is possible to display an image while transmitting the area PA.

6A-6D are plan views illustrating an alignment key according to various embodiments of the present invention. 6A to 6D are enlarged views of one pixel P provided on the first display substrate 100 or the second display substrate 300. FIG. 6A to 6D show the first alignment key K1 provided on the first display substrate 100 but may be the second alignment key K2 provided on the second display substrate 300. However, The first alignment key K1 and the second alignment key K2 are symmetrical.

6A to 6D, one pixel P provided on the first display substrate 100 includes a red light emitting portion RE, a green light emitting portion GE, and a blue light emitting portion EA1 in a first light emitting region EA1. (BE), and a white light emitting portion (WE). 6A, a first alignment key K1 having a half cross shape may be disposed in the first transmission area TA1, and a first alignment key K1 having a rectangular shape may be disposed as shown in FIG. 6B, May be disposed. As shown in FIG. 6C, the first alignment key K1 having a semi-elliptical shape may be disposed in the first transmission area TA1, and the first alignment key K1 having a semi- K1 may be disposed.

In this manner, the first alignment key K1 may have a shape in which the various shapes are cut in half, and the second alignment key K2 has the other half shape so that the transparent display device can be divided into the first display panel 100 The two first alignment keys K1 and the second alignment keys K2 symmetrically can be seen as one type when viewed from the first display panel 300 toward the second display panel 300. [ Accordingly, the transparent display device according to an embodiment of the present invention can display the first display panel 100 and the second display panel 300 using the first alignment key K1 and the second alignment key K2, The first display panel 100 and the second display panel 300 are not properly aligned so that the transmissivity of the first and second transmissive areas TA1 and TA2 Thereby preventing a problem that may be deteriorated.

Hereinafter, the light control device 200 according to an embodiment of the present invention will be described in more detail with reference to FIGS. 7 and 8. FIG.

FIG. 7 is a plan view showing a light control device according to an embodiment of the present invention, and FIG. 8 is a sectional view taken along line III-III 'of FIG.

The light control device 200 according to an embodiment of the present invention can block light incident in the light shielding mode and transmit light incident in the light transmission mode.

7 and 8, a light control device 200 according to an embodiment of the present invention includes a light control area LCA and a non-control area NCA, A board 270 is disposed.

The light control area LCA is disposed inside the non-control area NCA. The light control area LCA may be provided at a position overlapping the display area DA of the first display panel 100 of Fig. 3 in which an image is displayed. The light control region LCA includes a first electrode 230, a second electrode 240, and a third electrode 240 disposed between the first base film 210 and the second base film 220, And a liquid crystal layer 250.

remind The first base film 210 and the second base film 220 are disposed to face each other. The first base film 210 and the second base film 220 may be plastic films. For example, the first base film 210 and the second base film 220 may be formed of a cellulose resin such as TAC (triacetyl cellulose) or DAC (diacetyl cellulose), a cycloolefin (COP) such as Norbornene derivatives, polyolefin such as poly (polycarbonate), PE (polyethylene) or PP (polypropylene), PVA (polyvinyl alcohol), PES polyether sulfone, polyether sulfone, polyetheretherketone (PEEK), polyetherimide (PEI), polyethylenenaphthalate (PEN), and polyethyleneterephthalate (PET); polyimide; polysulfone; or fluoride resin But is not limited thereto.

The first electrode 230 is disposed on the first base film 210 to face the second base film 220. The second electrode 240 is provided on one surface of the second base film 220 facing the first base film 210. Each of the first and second electrodes 230 and 240 may be a transparent electrode. For example, each of the first and second electrodes 230 and 240 may include an oxide (e.g., AgO or Ag2O or Ag2O3), an aluminum oxide (e.g., Al2O3), a tungsten oxide (e.g., WO2 or WO3 or W2O3) (Eg, MgO), molybdenum oxide (eg MoO3), zinc oxide (eg ZnO), tin oxide (eg SnO2), indium oxide (eg In2O3), chromium oxide (eg CrO3 or Cr2O3) (E.g., Sb2O3 or Sb2O5), titanium oxides such as TiO2, nickel oxides such as NiO, copper oxides such as CuO or Cu2O, vanadium oxides such as V2O3 or V2O5, ), Iron oxide (eg Fe2O3 or Fe3O4), niobium oxide (eg Nb2O5), indium tin oxide (eg ITO), indium zinc oxide (eg IZO) Aluminum doped zinc oxide (ZAO), aluminum-doped tin oxide (eg, aluminum tin oxide, TAO) or antimony tin oxide (eg, Antimony Tin Oxide, AT O), but is not limited thereto.

remind The liquid crystal layer 250 may be a dynamic scattering mode liquid cyrstal layer comprising liquid crystals, dichroic dyes, and ionic materials. In the dynamic scattering mode, when voltages are applied to the first and second electrodes 230 and 240, liquid crystals and dichroic dyes are randomly moved by ionic materials. In this case, the light incident on the liquid crystal layer 250 can be scattered by the liquid crystals moving randomly or absorbed by the dichroic dyes, so that a light shielding mode can be realized.

In addition, the liquid crystal layer 250 may be a guest host liquid crystal layer including liquid crystals and dichroic dyes. In this case, the liquid crystals may be a host material and the dichroic dyes may be a guest material.

In addition, the liquid crystal layer 250 can be a polymer network liquid crystal layer comprising liquid crystals, dichroic dyes, and a polymer network. In this case, the liquid crystal layer 250 can increase the scattering effect of light incident due to the polymer network. When a polymer network is included, the light shielding ratio can be increased as compared with the case where the polymer network is not shielded. 6 illustrates that the liquid crystal layer 250 is implemented as a guest host liquid crystal layer for convenience of explanation.

8, a liquid crystal layer 250 according to an exemplary embodiment of the present invention includes a liquid crystal cell 251, a first alignment layer 253, a second alignment layer 255, and a barrier 260 .

The liquid crystal cell 251 is provided in the liquid crystal region LA and includes a liquid crystal 251a disposed between the first base film 210 and the second base film 220 and between the barrier ribs 260, (251b).

The liquid crystal 251a may be a plurality of positive liquid crystals arranged in a vertical direction (Z-axis direction) when a voltage is applied to the first and second electrodes 230 and 240. The plurality of dichroic dyes 251b may be arranged in the vertical direction (Z-axis direction) when a voltage is applied to the first and second electrodes 230 and 240 like the liquid crystal 251a.

The dichroic dye 251b may be a dye that absorbs light. For example, the dichroic dye 251b absorbs light other than a black dye or a specific color (for example, red) that absorbs all of light in a visible light wavelength range and transmits light of a specific color ), Which reflects the light of the wavelength band. For example, the dichroic dyes 251b may be dyes having a color of any one of red, green, blue, and yellow, or a mixture thereof. have. That is, an embodiment of the present invention can shield the background while displaying various colors in the light shielding mode. Therefore, one embodiment of the present invention can provide a variety of colors in a light-shielding mode, so that a user can feel aesthetic feeling. For example, the transparent display device according to an exemplary embodiment of the present invention can be used in a public place, and when applied to a smart window or a public window requiring a transmission mode and a light-shielding mode, Shading can be expressed.

The first alignment film 253 is disposed on the first base film 210. The first alignment film 253 is disposed on the first electrode 230 facing the second base film 220.

remind The second alignment film 255 is provided on one surface of the second electrode 240 facing the first base film 210. The first and second alignment layers 253 and 254 are formed so that the long axis direction of the liquid crystal 251a and the dichroic dye 251b are aligned in the vertical direction Z Axis direction). The first and second alignment layers 253 and 254 may be polyimide (PI).

remind The barrier ribs 260 are provided in the barrier rib regions PA. The barrier ribs 260 are disposed between the first base film 210 and the second base film 220 and disposed on the side surfaces of the liquid crystal cell 251. The plurality of barrier ribs 260 may be vertically provided from the first base film 210, but the present invention is not limited thereto. The barrier ribs 260 are disposed between the liquid crystal cells 251 to maintain a cell gap of the liquid crystal cells 251. The ratios of the liquid crystals 251a and the dichroic dyes 251b to the liquid crystal cells 251 can be kept almost the same or the same due to the barrier ribs 260. [

The barrier ribs 260 may be formed of a transparent material. In this case, the barrier ribs 260 may be formed of any one of photo resist, photo-curable polymer, and polydimethylsiloxane, but the present invention is not limited thereto. The barrier ribs 260 may be arranged in a stripe form, but are not limited thereto. The barrier ribs 260 may be arranged in a honeycomb shape or p (p is a positive integer of 3 or more) square shape.

Each of the barrier ribs 260 may be disposed corresponding to each of the light emitting regions EA of the first display panel 100, but is not limited thereto.

The non-control area NCA is an area other than the light control area LCA and is disposed so as to surround the light control area LCA. An adhesive material SL such as a sealant is disposed between the first base film 210 and the second base film 220 in the uncontrolled area NCA so that the first base film 210 and the second base film 220 ).

The film circuit board 270 is attached to the pad area PA of the uncontrolled area NCA. The film circuit board 270 includes a driving voltage wiring, a common voltage wiring, and a voltage supply unit 280.

The driving voltage wiring is electrically connected to the first pad 231 to supply a voltage to the first electrode 230 connected to the first pad 231.

The common voltage wiring is electrically connected to the second pad 241 to supply a voltage to the second electrode 240 connected to the second electrode 240.

The voltage supply unit 280 is electrically connected to the common voltage wiring, and supplies the voltage to the second electrode 240 through the common voltage wiring 262.

Since the light control device 200 according to an embodiment of the present invention can realize a light shielding mode for blocking light by the light control area LCA, the first display panel 100 and the second display panel 300, it is possible to prevent the contrast ratio of the transparent display device from being lowered.

9 is a view illustrating a method of manufacturing a transparent display device according to an embodiment of the present invention.

Referring to Fig. 9, first, the light control device 200 is disposed on one side of the first display panel 100 having the first alignment key K1. Then, the second display panel 300 having the second alignment key K2 is arranged on one side of the light control device 200. [ Then, the polarizing plate POL is disposed on the other side of the first display panel 100. [ Then, a reflection plate RF is disposed on one side of the second display panel 300. [

Then, the light passes through the first display panel 100, the light control device 200, and the second display panel 300 in the polarizing plate POL so as to be reflected by the reflection plate RF. At this time, the light is irradiated through the camera CM, and the light reflected by the reflection plate RF is observed through the camera CM.

The first light L1 irradiated through the camera CM first passes through the polarizing plate POL and when the first light L1 passes through the polarizing plate POL, the first light L1 is emitted as vertical or horizontal linear polarized light L2. do. For example, the second light L1 emitted as vertical light is incident on the first display panel 100. [ The second light L2 incident on the first display panel 100 passes through the first alignment key K1 and the second light L2 that is linearly polarized light is composed of a quarter wave plate qwp When passing through the first align key K1, it is emitted as circularly polarized light L3 rotating leftward or rightward. For example, the third light L3 emitted as a left handed circularly polarized light is incident on the second display panel 300. Since the third light L3 incident on the second display panel 300 does not overlap with the second alignment key K2, the third light L3 passes therethrough. The third light L3 that has passed through the second display panel 100 is incident on the reflection plate RF and is reflected again in the direction incident by the reflection plate RF. At this time, the third light L3 reflected by the reflection plate RF becomes the circularly polarized light L4 rotating in the opposite direction. For example, the fourth light L4 reflected by the right handed circularly polarized light is incident on the second display panel 300 again. Since the fourth light L4 incident on the second display panel 300 does not overlap with the second alignment key K2, the fourth light L4 passes therethrough. The fourth light L4 having passed through the second display panel 300 is incident again on the first display panel 100. [ The fourth light L4 incident on the first display panel 100 passes through the first alignment key K1 again so that the circularly polarized light L is transmitted through the quarter wave plate qwp 1 linear key K1, it is emitted as vertical or horizontal linearly polarized light L5. The fifth light L5 reentered with the circularly polarized light in the opposite direction to that of the first incident light by the reflection plate RF is emitted as horizontal light through the first alignment key K1. The fifth light L5 converted into the horizontal light is not allowed to pass through the polarizing plate POL that emits vertical linear polarized light, so that it is recognized as black by the camera CM.

The second alignment key K2 according to an embodiment of the present invention also includes a quarter wavelength plate qwp, and the position can be recognized in the same manner as the first alignment key K1. Accordingly, the transparent display device according to an embodiment of the present invention includes a first alignment key K1 and a second alignment mark K1, each of which is composed of a quarter wave plate qwp, using a polarizer POL and a reflection plate RF, When the first key K1 and the second key K2 symmetrically appear in a single form when the key K2 is looked down on the camera CM, It can be confirmed that the second display panel 300 is properly aligned.

Accordingly, the transparent display device according to an embodiment of the present invention can display the first display panel 100 and the second display panel 300 using the first alignment key K1 and the second alignment key K2, It is possible to prevent the problem that the transmittance of the first and second transmissive areas TA1 and TA2 may be lowered due to the lack of alignment of the first and second transparent areas TA1 and TA2.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those embodiments and various changes and modifications may be made without departing from the scope of the present invention. . Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.

100: first display panel 110: first display substrate
111: first lower substrate 112: first upper substrate
120: Gate driver 130: Source drive IC
140: flexible film 150: substrate circuit board
160: timing control unit 200: light control device
210: first base film 220: second base film
230: first electrode 231: first pad
240: second electrode 241: second pad
250: liquid crystal layer 251: liquid crystal cell
251a: liquid crystal 251b: dichroic dye
253: first orientation film 255: second orientation film
260: partition wall 270: film circuit board
280: voltage supply unit 300: second display panel
310: second display substrate 311: second lower substrate
312: second upper substrate K1: first alignment key
K2: 2nd Align key

Claims (11)

A first display panel having a first alignment key;
A light control device disposed on one side of the first display panel; And
A second display panel disposed on one side of the light control device and having a second alignment key,
Wherein the shape of the first alignment key and the shape of the second alignment key are symmetrical to each other. The method according to claim 1,
Wherein the first alignment key and the second alignment key comprise a quarter wavelength plate. The method according to claim 1,
Wherein the first alignment key and the second alignment key do not overlap each other. The method according to claim 1,
Wherein the first display panel includes a first transmissive region through which light is transmitted and a first luminescent region in which pixels are arranged,
Wherein the second display panel includes a second transmissive area overlapping the first transmissive area, and a second light emitting area,
Wherein the first alignment key and the second alignment key are disposed in the first transmission region and the second transmission region, respectively. 5. The method of claim 4,
Wherein the first alignment key and the second alignment key are made of a transparent material. 5. The method of claim 4,
The first display panel includes:
A transistor disposed on the first lower substrate;
A bank disposed on the thin film transistor; And
And a first upper substrate disposed on the bank,
Wherein the first alignment key is provided below the bank or on the first upper substrate. 5. The method of claim 4,
The second display panel includes:
A transistor disposed on the second lower substrate;
A bank disposed on the thin film transistor; And
And a second upper substrate disposed on the bank,
And the second alignment key is provided on the lower bank or on the second upper substrate. The method according to claim 1,
The light control device includes:
A first base film and a second base film facing each other;
And a liquid crystal cell disposed between the first base film and the second base film. Disposing a light control device on one side of a first display panel having a first alignment key;
Disposing a second display panel having a second alignment key on one side of the light control device;
Disposing a polarizer on the other side of the first display panel;
Disposing a reflector on one side of the second display panel; And
And a step of irradiating light from the polarizing plate through the first display panel, the light control device, and the second display panel so as to be reflected on the reflection plate. 10. The method of claim 9,
Wherein the first alignment key and the second alignment key comprise a quarter wavelength plate. 10. The method of claim 9,
Wherein the first alignment key and the second alignment key do not overlap with each other.

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